Fuse



F. H. MILLER. FUSE.

APPLICATION FILED MAYIS. I9l8.

1,4 Patented Dec. 12,1922.

WITNESSES: 'INVENIOR QZ/M v fieden'c/f/i/W/er BY I r ATTORNEY Patented Dec. 12, 1922.

UNITED STATES, PATENT FREDERICK H. MIL ER, or WILKINSBURG,PENNSYLVANIA, essrenon T0 WESTING- HOUSE ELECTRIC & MANUFACTUPJNG COMPANY, A CORPORATION OF PENNSYL- VANIA.

Application: filed May 13,

To-aZZ whom it may concern:

Be it known that I, FREDERICK H. Miriam, a citizen of the United States, and a resident of VVilkinsb'urg, in the county of Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Fuses, of which the following is a specification.

My invention relates to' fuses and particularly to refillable fuses of the cartridge type. a One object of my invention is to provide a fuse of the above-indicated character that shall have rugged and durable end ferrules which maybe securely engaged in clamp.- ing or wedging relation with the insulating casing thereof. I 1

Another objectof my invention is toprovide an end ferrule fora cylindrical fuse cartridge that shall permit eflicient' use of a cartridge cylinder of. wound paper or other material. l

Heretofore, it has been usual, in making refillable fuses, to secure end ferrules to the cylindrical casings thereof by screws, rivets or cement. Cement alone, as a means of attachment of ferrules to a fuse casing, is not adequate toresist explosions of any considerable violence within the casing. Rivets necessarily weaken the ends of the cylinder by reason ofthebreaks in the material caused thereby, and the use of an internally screw-threaded ferrule that co-o-perates with an externally-threaded fiber casing is permissible only'when the fiberof the casing is of such homogeneous structure as to permit. threading thereof. Tubes or casings of such nature are not usually as strong as those'that are made upby winding continuous layers of paper or other fabric that are impregnated with a binder and hard.- ened by heat,*but the latter ordinarily may not be threaded to efficiently co-operate, for any considerable time, with ametal ferrule.

'ln practicing'Tmy invent-ion, I provide means whereby a metal ferrule may be clamped'or wedged in position on the end of a cartridge casing and thereby permit the use of a casing of wound paper or other sheet material.

The single figure of the accompanying drawing is a longitudinal view, partially in elevation and partially in section, of a fuse embodying my invention.

FUSE.-

1918. Serial No. 234,098."

Ayhollow insulating casing 1, of wound paper or other sheet material and-initially of ordinary cylindrical shape, is provided, at its ends, with metal terminal cap members 2 that permitits insertion in suitable jaw terminals (not shown) of any electrical circuit in which it. is desired that a fuse be located.

Each of the members 2 comprises, in general,;,a perforated cap member 3 that is fitted-to the casing 1, an outer collar or nut 4 that secures the member 3 to the casing 1, a slotted washer v5 in the member 3 and ascrewethreaded plug 6 that is a closure for the member 3 and also functions as a binding screw for'one end of a fusible eleme'nt7 disposed inthe casing 1. i I a Each of the members? has an'exteriorly andinteriorly screw-threaded annular outerend ring of cylindrical base portion 8 from which spaced annular'concentric flanges 9 and-10 project. The inner flange 9 has a smooth continuous cylindrical outer face 11 that fits snugly in the end. of the cas-. ing 1 and has a tapered inner face 12. The outer flange 10 is longitudinally slotted from its outer end to its place of joinder with the-portion8 to form a plurality of relatively narrow fingers '13 that form a smooth cylindrical I surface on, their inner sides to conform to the contour of the'outer 10 arethen pressed to completely embrace the rim of the casing, in theposition sub stantially as shown, and the collar 4 is moved toward the same. By turning the collar 1, it will advance outwardly from the casing l on the portion 8, and the tapered face 14 thereof will be gradually brought into engagement with the outer taperedfaces of the fingers 13. Continued advancement of the collars causes the fin-- gers 13 to be firmly pressed against the casing and they may become embedded in the same for a relatively slight distance at their free ends, as indicated. By reason of the reinforcement given to the casing l, by the inner flange 9, the collapse of the end of the latter is prevented, even under great pressure. Thus, substantially an annular dovetail .onnection is established be tween the members 13 and the casing l which retains substantially its full thickness.

The absence of any considerable abrasions in the casing 1 that would be caused by threading or riveting the ferrule thereto, lends strength to a form of structure that may be additionally strengthened by forming the same of superimposed layers of wound paper or other sheet fabric and impregnated with a suitable binder.

The tapered face 12 of the inner flange 9 extends from a line that is tangent to the bore of the casing 1 to an annular shoulder 15, against which the slotted washer 5 rests, and thereby offers no obstruction to the passage of the end of the fusible element 7 when the latter is being positioned in the casing l. The end of the element 7 extends through the slotted washer 5 and is bent to lie thereon in which position it may be secured by turning the plug 6 to cause the same to advance, with respect to the por' tion 3 to the position shown. An aperture 16 in the plug 6 permits the escape of are gases caused by rupture of the fusible element 7. I

While I have shown and described a particular form of my invention, changes may be effected therein without departing from the spirit and scope thereof, as set forth in the appended claims.

I claim as my invention:

1. The combination with a tubular member, of a clamping member having relatively movable means for engaging the inner and outer perimeters of the tubular member to securely grip the same.

2. The combination with a tubular member, of a clamping member having relatively movable means for engaging the inner and outer perimeters of the tubular member and compressing the walls thereof convergingly from its end to securely grip the same.

3. A fuse device comprising a tubular casing, an end ferrule having spaced concentric perimetral flanges embracing the rim of said casing, and means whereby said flanges may be moved relatively to each other to securely clamp said ferrule in position with respect to said casing.

4. A fuse device comprising a tubular casing, an end ferrule having spaced concentric perimetral flanges embracing the rim of said casing, one of said flanges being relatively flexible, and means for flexing said flange toward the other to securely clam said ferrule in position with respect to sai, casing.

5. The combination with a tubular member, of an end member therefor having spaced concentric perimetral flanges embracing the rim of said tubular memher, one of said flanges being yieldably constructed and flexed toward the other to securely clamp the end member in position with respect to the tubular member.

6. A fuse device comprising a tubular casing, an end ferrule having spaced concentric perimetral flanges embracing the rim of said casing, one of said flanges having portions so cut away as to permit diametral movement of the same to securely clamp said ferrule in position with respect to said casmg.

7. A fuse device comprising a tubular casin an end ferrule having spaced concentric perimetral flanges embracing the rim of said casing, one of said flanges being slotted to permit bendin of the same toward the other of said flanges to securely clamp said ferrule in position with respect to said casin 8. A fuse evice comprising a tubular casing, a ferrule therefor having a relatively movable portion clamped over the end of said casing and means within said casing for reinforcing the same against the inward pressure of said clamped portion.

9. A fuse device comprising a tubular casing, an end ferrule having spaced concentric perimetral flanges embracing the rim of said casing, one of said flanges having a plurality of resilient longitudinal projections whereby the same may be pressed inwardly to securely engage said casing.

10. A fuse device comprising a hollow cylindrical. casing, a hollow frusto-conical end ferrule therefor having an annular exteriorly threaded end portion from which spaced concentric annular walls project. the adjacent faces of said walls being initially cylindrical to receive the rim of said casing, the other faces thereof being convergingly tapered from the annular base portion and the outer of said walls being longitudinally slotted and a partially interiorlv threaded and partially interiorly tapered collar member for cooperation with said ferrule to clamp the same securely to said casing.

11. The combination with a. tubular member. of an end member therefor having a perimetral flange around the interior thereof and a relatively movable member co-o'pcrating with the end member for com ressing the tubular member against said ange to hold the end member in position.

12. The combination with a tubular member, of an end member therefor, means for reinforcing the end of the tubular member around itsinner perimeter and means co-operatlng between the tubular member and the ber, of an end member thereforv having means engaging the inner surface of the tubular member for reinforcing the end of the-tubular member, and means co-operating With the tubular member andthe end memher for compressing the tubular member against said reinforcing means to hold the end member lnposltlon. In test mony whereof, I have hereunto subscribed my name this 30th day of April,

FREDERICKH. MILLER. 

